Chapter 9: Muscle Structure

Question 0

Myofilaments

Answer 0

Structure making up a sarcomere of a myofibril.
Myosin or Actin.
Contractile- 2 proteins slide past each other to shorten muscle.

Question 1

Muscle fibers

Answer 1

Elongated cells
Striated
Multinucleated
In endomysium

Question 2

Sarcomere

Answer 2

Segment of myofibril between 2 Z disc.
Contractile movement
Made of Actin and Myosin

Question 3

Sarcolemma

Answer 3

Muscle plasma membranes

Question 4

Sarcoplasm

Answer 4

Cytoplasm of a muscle cell

Question 5

Epimysium

Answer 5

Connective tissue wrapping around the muscle

Question 6

Fascicle

Answer 6

Discrete bundle of muscle cells that are segregated from the rest of the muscle by connective tissue covering.
Wrapped in Perimysium.

Question 7

Perimysium

Answer 7

Connective tissue wrapping around the fascicle.

Question 8

Endomysium

Answer 8

Connective tissue wrapping around the muscle fiber

Question 9

Myofibrils

Answer 9

Complex organelle composed of bundles of myafilaments

Question 10

Actin

Answer 10

Thin filaments

Question 11

Myosin

Answer 11

Thick filaments

Question 12

Sarcoplasmic reticulum

Answer 12

Like smooth endoplasmic reticulum
Surrounds each myofibril
Regulates the intracellular calcium levels

Question 13

T tubule

Answer 13

Reaches inward from membrane through the fiber

Allows extracellular fluid to move throughout the fiber